It was a day 6 embryo...............it's a bit older than normal as last IVF cycle they were holding off trying to do a ET to see if my ohss/health improved.......but it didn't - so hence the reason our frosties are older than average . The pain was quite sharp and I had to go lie down for a few hours (this was day 2), then as quickly as it came on, the pain was over within about 5-6hours. Oh I really hope it was implanting. I didn't get an implantation bleed though........although they say that doesn't always happen. You beautiful ladies have given me some more hope now - fingers crossed. I think it was a good sign.......last time BFN and there were no signs like this. Only 8 days to wait then we will know for certain! Thank you for the replies